ap extension - question on docs

[vendy9999]

hello,

 

i had sent my ap extension docs to a PO box addres in phoenix since
my i485 filing recept started with LIN.

usps says it is delivered.

now,whats next..how do i know that all docs are perfect and it is being processed.

wht happens,if docs are incomplete..

do we get a  receipt notice for ap extesion filing as well

 

thanks

[Attorney_11]

Generally, USCIS generates receipt notices for applications and petitions filed with it.